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Dynamics of holographic images of scalar-tensor-vector gravity-AdS black holes

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Chinese Physics C 2024年第9期48卷 274-290页

作者： Xin-Yun Hu m.Israr aslam Rabia Saleem Xiao-Xiong Zeng College of Economic and management Chongqing Jiaotong UniversityChongqing 400074China Department of mathematics COMSATS University IslamabadLahore-CampusLahore 54000 Pakistan State Key Laboratory of mountain Bridge and Tunnel Engineering Chongqing Jiaotong UniversityChongqing 400074China Department of mechanics Chongqing Jiaotong UniversityChongqing 400074China

Using AdS/CFT correspondence,we analyze the holographic Einstein images via the response function of the complex scalar field as a probe wave on an AdS Schwarzschild scalar-tensor-vector gravity(STVG)black hole(BH).We find that the amplitude of the response function||decreases with increasing values of coupling parameter a and increases with decreasing temperature *** frequencyωof the wave source also plays a significant role in wave periods;as we increase the values ofω,the periods of waves decrease,indicating that the total response function closely depends on the wave ***,we investigate the optical appearance of the holographic images of the BH in *** found that the holographic ring always appears with surrounding concentric stripes when the observer is located at the north pole,and an extremely bright ring appears when the observer is at the position of the photon sphere of the *** ring changes into a luminosity-deformed ring or a bright light spot as the observational angle *** corresponding brightness profiles show that the luminosity of the ring decreases and the shadow radius increases with increasing values of *** relation between temperature T and the inverse of the horizonh_e is discussed;T is small at the beginning of the horizon he and then increases as the horizon radius *** effect can be used to distinguish the STVG BH solution from other BH ***,these significant features are also reflected in the Einstein ring and corresponding brightness *** addition,we compare the results obtained by wave optics and geometric optics,which align well,implying that the holographic scheme adopted in this study is valid.

关键词： scalar-tensor-vector gravity shadows AdS/CFT correspondence

Exploring the electromagnetic shielding behavior of lanthanum doped calcium nanoferrites

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Journal of Rare Earths 2024年第11期42卷 2128-2136页

作者： E.Ahilandeswari K.Sakthipandi R.Rajesh Kanna G.Rajkumar B.Ganesh Babu S.Arunmetha aslam Hossain P.Sakthivel V.Rajendran m.Srinidhi Raghavan Department of Physics SRM TRP Engineering College Department of Electronics and Communication Engineering M. Kumarasamy College of Engineering Department of Physics Easwari Engineering College Department of mechanical Engineering SRM TRP Engineering College Centre for Advanced Energy Studies Department of Electronics and Communication EngineeringKoneru Lakshmaiah Education Foundation Smart materials Research Institute Southern Federal University Centre for materials Science Department of PhysicsScience and HumanitiesFaculty of EngineeringKarpagam Academy of Higher Education Centre for Nanotechnology Academy of Maritime Education and Training (Deemed to be University) Department of Chemistry and Centre for Nano-materials and Displays B.M.S. College of Engineering

The present study focuses on the synthesis and characterization of lanthanum(La3+)-doped calcium nanoferrites(CaLaxFe2-xO4:x=0.025,0.050,0.075 and 0.100) using the sonochemical *** techniques were employed to analyze the effect of La3+infusion,Raman spectroscopy confirms the presence of active A1g,T2gand Egmodes in the CaLaxFe2-xO4nanoferrite,indicating the formation of an active ferrite *** introduction of La3+doping results in a significant increase in the band gap energy,rendering the nanoferrites insulating（3.23-3,57 eV）.At higher frequencies,the impedance studies reveal minimal losses and better AC conductivity,pointing to improved dielectric *** higher frequencies,the Q-factor of La-doped calcium nanoferrites shows lower electromagnetic *** m-H curve exhibits ferromagnetic behavior,with La3+-doped calcium nano ferrites displaying a saturation magnetization ranging from 12.72 to 18.10 emu/*** incorporation of La3+also induces enhanced electrical polarization,leading to notable dielectric loss and increased absorption of electromagnetic ***,these CaLaxFe2-xO4nanoferrites demonstrate potential as effective microwave absorbers across a wide frequency range,with significant shielding absorption observed at 8.8-9.1 GHz.

关键词： Dielectric magnetism microwave absorption Nanoferrites Rare earths Structural properties

Point-of-care ultrasonography spotlight:Could venous excess ultrasound serve as a shared language for internists and intensivists?

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World Journal of Critical Care medicine 2024年第2期13卷 126-136页

作者： Anosh aslam Khan Hasham Saeed Ibtehaj Ul Haque Ayman Iqbal Doantrang Du Abhilash Koratala Department of Internal medicine Monmouth Medical CenterLong BranchNJ 07740United States Department of Internal medicine Trinitas Regional Medical CenterElizabethNJ 07202United States Department of Anesthesiology Dr.Ruth K M Pfau Civil HospitalKarachi 74400Pakistan Department of Internal medicine Dow Medical CollegeKarachi 74200Pakistan Division of Nephrology Medical College of WisconsinMilwaukeeWI 53226United States

Point-of-care ultrasonography(POCUS),particularly venous excess ultrasound(VExUS)is emerging as a valuable bedside tool to gain real-time hemodynamic *** modality,derived from hepatic vein,portal vein,and intrarenal vessel Doppler patterns,offers a scoring system for dynamic venous congestion *** an assessment can be crucial in effective management of patients with heart failure *** facilitates diagnosis,quantification of congestion,prognostication,and monitoring the efficacy of decongestive *** such,it can effectively help to manage cardiorenal syndromes in various clinical *** or eVExUS explores additional veins,potentially broadening its *** VExUS demonstrates promising outcomes,challenges persist,particularly in cases involving renal and liver parenchymal disease,arrhythmias,and situations of pressure and volume overload *** in utilizing spectral Doppler is pivotal for clinicians to effectively employ this ***,the integration of POCUS,especially advanced applications like VExUS,into routine clinical practice necessitates enhanced training across medical specialties.

关键词： Point-of-care ultrasonography Ultrasound Venous excess ultrasound Doppler Congestion Heart failure

Accretion onto the magnetically Charged Regular Black Hole

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Chinese Physics Letters 2017年第7期34卷 38-40页

作者： m.Azam A.aslam Division of Science and Technology University of Education Lahore 54590 Pakistan

We investigate the accretion process for static spherically symmetric geometry, i.e., magnetically charged regular black hole with isotropic fluid. W＇e obtain generalized expressions for the velocity （u（r））, speed of sound （cs2）, energy density （ρ（r）） and accretion rate （m） at the critical point near the regular black hole during the accretion process. We also plot these physical parameters against fixed values of charge, mass and different values of equation of state parameter to study the process of accretion. We find that radial velocity and energy density of the fluid remain positive and negative as well as rate of change of mass is increased and decreased for dust, stiff, quintessence fluid and phantom-like fluid, respectively.

关键词： Accretion onto the magnetically Charged Regular Black Hole

B→0^+(1^+)+ missing energy in unparticle physics

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Chinese Physics C 2009年第5期33卷 332-339页

作者： m.Jamil aslam 吕才典 Institute of High Energy Physics CAS Department of Physics COMSATS Institute of Information Technology School of Physics and Technology Nanjing Normal University

We examine the effects of an unparticle U as a possible source of missing energy in the p-wave decays of a B meson. The dependence of the differential branching ratio on the K0^＊（K1） - meson＇s energy is discussed in the presence of scalar and vector unparticle operators and significant deviation from the standard model value is found after addition of these operators. Finally, we have shown the dependence of the branching ratio for the above-mentioned decays on the parameters of unparticle stuff like effective couplings, cutoff scale Au and the scale dimensions du.

关键词： unparticle missing energy B physics

A Critical Review of Social Resilience Properties and Pathways in Disaster management

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International Journal of Disaster Risk Science 2021年第6期12卷 790-804页

作者： A.m.aslam Saja melissa Teo Ashantha Goonetilleke Abdul mZivath Faculty of Engineering.South Eastern University of Sri Lanka Oluvil 32360Sri Lanka Science and Engineering Faculty.Queensland University of Technology(QUT) Brisbane.Queensland 4001Australia Zedz Consultants Pty Ltd HillcrestQLD 4118Australia

Resilience as a concept is multi-faceted with complex *** a disaster context,there is lack of consistency in conceptualizing social *** results in ambiguity of its definition,properties,and pathways for assessment.A number of key research gaps exist for critically reviewing social resilience conceptualization,projecting resilience properties in a disaster-development continuum,and delineating a resilience trajectory in a multiple disaster *** review addressed these research gaps by critically reviewing social resilience definitions,properties,and *** review found four variations in social resilience definitions,which recognize the importance of abilities of social systems and processes in disaster phases at different levels.A review of resilience properties and pathways in the disaster resilience literature suggested new resilience properties—“risk-sensitivity”and“regenerative”in the timeline of two consecutive *** review highlights a causal pathway for social resilience to better understand the resilience status in a multi-shock scenario by depicting inherent and adaptive resilience for consecutive disaster scenarios and a historical case study for a resilience trajectory in a multiple disaster *** review findings will assist disaster management policymakers and practitioners to formulate appropriate resilience enhancement strategies within a holistic framework in a multi-disaster timeline.

关键词： Community resilience Disaster resilience Resilience assessment Resilience measurement Resilience properties

An Improved model Reduction method on AIms for N-S Equations Using multilevel Finite Element method and Hierarchical Basis

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Numerical mathematics(Theory,methods and Applications) 2019年第1期12卷 115-133页

作者： m.Nauman aslam Jiazhong Zhang Nannan Dang Riaz Ahmad School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

A numerical method is proposed to approach the Approximate Inertial man-ifolds(AIms)in unsteady incompressible Navier-Stokes equations,using multilevel fi-nite element method with hierarchical basis *** AImS,the unknown variables,velocity and pressure in the governing equations,are divided into two com-ponents,namely low modes and high ***,the couplings between low modes and high modes,which are not accounted by standard Galerkin method,are consid-ered by AIms,to improve the accuracy of the numerical ***,the multilevel finite element method with hierarchical basis functions is introduced to approach low modes and high modes in an efficient *** an example,the flow around airfoil NACA0012 at different angles of attack has been simulated by the method presented,and the comparisons show that there is a good agreement between the present method and experimental *** particular,the proposed method takes less computing time than the traditional *** a conclusion,the present method is efficient in numer-ical analysis of fluid dynamics,especially in computing time.

关键词： Fluid dynamics model reduction inertial manifolds multilevel finite element method hierarchical basis functions nonlinear dynamics

Group Generated by Two Elements of orders 2 and 4 Acting on Real Quadratic Fields

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Acta mathematica Sinica,English Series 1993年第1期9卷 48-54页

作者： Q.mushtaq m.aslam Department of mathematics Quaid-i-Azam UniversityIslamabauPakistan

Coset diagrams for the orbit of the group G=acting on realquadratic fields give some interesting *** using these coset diagrams,we show thatin the orbit pG,where p=(a+n)/c,the non-square positive integer n does not change itsvalue and the real quadratic irrational numbers of the form p,where p and its algebraic conjugate(α-n)/c have different signs,are finite in number and that part of the coset diagram containingsuch numbers forms a single closed path,which is the only closed path in the orbit of p.

关键词： Group Generated by Two Elements of orders 2 and 4 Acting on Real Quadratic Fields

Recent Progress and Approaches on Carbon-Free Energy from Water Splitting

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纳微快报：英文版 2019年第4期11卷 791-816页

作者： aslam Hossain K.Sakthipandi A.K.m.Atique Ullah Sanjay Roy Department of Physical and Inorganic Chemistry Institute of Natural Science and MathematicsUral Federal UniversityYekaterinburgRussia Department of Physics Sethu Institute of TechnologyKariapattiTamil Nadu 626115India Nanoscience and Technology Research Laboratory Atomic Energy CentreBangladesh Atomic Energy CommissionDhaka 1000Bangladesh Department of Chemistry Shibpur Dinobundhoo Institution(College)HowrahWest Bengal 711102India

Sunlight is the most abundant renewable energy resource,providing the earth with enough power that is capable of taking care of all of humanity’s desires-a hundred times ***,as it is at times diffuse and intermittent,it raises issues concerning how best to reap this energy and store it for times when the Sun is not *** increasing population in the world and modern economic development,there will be an additional increase in energy *** that use daylight to separate water into individual chemical elements may well be the answer to this issue,as water splitting produces an ideal *** such devices that generate fuel were to become widely adopted,they must be low in cost,both for supplying and ***,it is essential to research for cheap technologies for water *** review summarizes the progress made toward such development,the open challenges existing,and the approaches undertaken to generate carbon-free energy through water splitting.

关键词： Water splitting Renewable energy sources Hydrogen generation Photocatalysis Nanostructure